track questions

[g60ing]

i have a 92 talon which i plan on tracking tomorrow for the first time. It wont be my first time at the track but the first time in an all wheel drive car. From your experiences how much boost can you squeeze out on stock injectors, without a controller, and some c16. Car has a 255 walbro 3 inch shorty,no cat no mufler. upgraded Ic pipes and a boost controller. everything is set to stock level boost on bpr6es plugs. How much room is there for a little more boost on the stock injectors and also on those plugs? Any suggestions would be greatly apreciated.

 

[JayRolla]

Buy a logger so you can see your knock. Turn it up till you knock a little and then go back to last boost setting without knock. Im guessing you could get 14psi without knock. My 1g with 2g pistons knocks at 13psi. If you dont have a logger dont go above 12psi expecially if you going to the track. You dont want to be detonating.

 

[1990talon]

Do you have a AFPR?

 

[g60ing]

no logger nor AFPR. All of the stuff came on the car, i just finished some wiring problem,swaped axles and plugs. Would race gas make a significant different knock wise?

 

[selmerguy]

no logger nor AFPR. All of the stuff came on the car, i just finished some wiring problem,swaped axles and plugs. Would race gas make a significant different knock wise?

I love when people take a basically stock car and put race gas in it to go faster. Without the ability to tune the c16 will not help very much. You need a logger to see knock before you turn up the boost to much. I would not go above 14psi on your current seup. Also IMO the C16 would be a waste of money.

 

[1990talon]

Well first I would get a AFPR and if you don't go extreme a logger is not necessary. I can not answer your question on the race gas because it would just be a guess. I just wanted to let you know you will over run the stock AFR.

 

[g60ing]

I love when people take a basically stock car and put race gas in it to go faster. Without the ability to tune the c16 will not help very much. You need a logger to see knock before you turn up the boost to much. I would not go above 14psi on your current seup. Also IMO the C16 would be a waste of money.

to my knowledge higher octane lessens the chance of detonation. I have built and raced turbo volkswagens. It seemed to make a difference in them. I was referring to the potential detonation due to the fact that i dont have a logger and i cannot count knock.

 

[selmerguy]

to my knowledge higher octane lessens the chance of detonation. I have built and raced turbo volkswagens. It seemed to make a difference in them. I was referring to the potential detonation due to the fact that i dont have a logger and i cannot count knock.

I have argued with people about this before and I have heard many different things. But what I believe is that the higher octane allows you to run leaner without detenation. The saying goes, "leaner is meaner." But you have to tune your car to the desired AFR. On 93 octane you want a afr of about 11.6:1. Even alittle richer is ok. On C16 you can co to about 12.5:1 at wot and be ok. These numbers are based on your motor being in good shape and being able to handel the stress assiocated with racing. You having no way to tune will actually run rich witch the stock cars do anyway and add the c16 on that and you will be richer. Now if you turn up the boost alot it might help but that is a chance i would not take with out a logger. Oh and another thing if you are running a 255 fuel pump get a afpr your stock fpr cant handle the flow from the 255.

 

[g60ing]

yeah they are coming. like i said the car is a week old, and yes it does run rich at stock boost, so basically my question was how much cushion i have there without somekind of logger, and any way to control the injectors. I am well aware of detonation potential. I just wanted to get some feedback as to boost vs knock and detonation on a similar setup, which is basically stock.

 

[selmerguy]

yeah they are coming. like i said the car is a week old, and yes it does run rich at stock boost, so basically my question was how much cushion i have there without somekind of logger, and any way to control the injectors. I am well aware of detonation potential. I just wanted to get some feedback as to boost vs knock and detonation on a similar setup, which is basically stock.

I would not go over 14psi.

 

[g60ing]

I would not go over 14psi.

Thanx fellas. Will keep you updated on the times tomorrow evening

 

[g60ing]

ok boys and girls. the event was rained out. but that is the least of my worries. Car made an awful noise coming home from the track in st gear at 5k rpm, boost was at 12 and than it quit running. It seems that my timing belt worked itself loose and that in turn bent all 16 valves rod #4 broke and knocked a fist sized chunk out of the block behind the ac compressor, it was the ####ing greatest thing ever!!! posibility number 2 could be that i spun a bearing which than created a chain reaction. anyway the block is ####ed. and so are the valves. How easy do these heads get messed up? any other reason this could have happened ? Oh anyone with a spare 6 bolt block, short or tall hit me up.